Electric-furnace lining



Patented Oct. 22, 1929 UNITED STATES PATENT OFFICE MILTON TILLEY, OF CLEVELAND. OHIO. ASSIGNOR T0 NATIONAL MALLEABLE AND STEEL CASTINGS COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO ELECTRIC-FURNACE LINING Ho Drawing.

My invention relates to electric furnace linings and particularly to linings used in furnaces which are substantially in continuous use. I have found with electric furnaces, which are used continuously instead of periodically, and particularly in furnaces lined with acid silica sand, that there is a tendency for the bottom to break away, and float up through the iron, thus cooling the iron and forming a slag of objectionable character.

In the usual periodic electric furnace oper-' ation the furnace bottom may be patched up without undue delay, but where the furnace is operated continuously the bottom is of course covered with molten metal and cannot be patched except by shutting down the furnace completely.

I have found by experiment that a lining formed of ordinary fire brick laid up close together in a grouting of fire clay and water, forms a practical and durable furnace bottom. Such a lining is very effective in the treatment of malleable iron as it enables an electric furnace to be run continuously and the fire brick is sufiiciently acid to retain the advantages of acid furnace operation.

The fire brick which I have used is the ordinary fire brick composed substantially all of comparatively pure aluminum silicate and the grouting is composed of the same material, but not like the fire brick, molded and burned into brick form.

My invention is also useful in electricv fur.- naces operated periodically as the durability of my improved lining likewise eliminates undue furnace delays which are frequently caused by the patching of linings, etc., which disorganize melting schedules and allow the furnace walls to cool and contract, thus shortening their life.

The terms and expressions which I have employed are used as terms of description and not of limitation, and I have no intention, in the use .of such terms and expressions, of excluding any mechanical equivalents of the features shown and described, or portions thereof, but recognize that various structural modifications are possible within the scope of the invention claimed. 7

Application filed August 18, 1927. Serial No. 213,982.

What I claim is:

1. In an. electric furnace, an acid bottom lining adapted for direct contact with the molten metal comprising ordinary fire brick laid up in a fire clay grouting.

2. In an electric furnace for treating malleable iron, an acid bottom lining adapted for direct contact with the molten metal composed of aluminum silicate brick laid up in a grouting of aluminum silicate.

' 3. In an electric furnace for treating malleable iron, an acid bottom lining adapted to direct contact with the molten metal composed of fire brick laid up closely together in a grouting of fire clay and water.

MILTON TILLEY. 

